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中文摘要：
通过求解采用ALE方法描述的运动坐标系Navier-Stokes方程组,分析均匀来流下雷诺数为150的静止和流向振荡的圆柱绕流．主要研究了强迫振荡频率和较大振幅比（A／D=0．3～1．2）对圆柱升力、阻力变化特性以及涡脱落模态的影响．研究表明,流向振荡圆柱绕流存在多种涡脱落模态,如对称S以及反对称A-Ⅰ, A-Ⅲ,A-Ⅳ等多种形式;比较研究结果,拓展了各模态下对应的锁定区域,并将其分为5个子区;A-Ⅰ模态中圆柱受力较以前所知更复杂;通过分析计算结果,发现最大加速度比Afc2／Dfs02可能是涡脱落模态（尤其是对称S模态）最有效的控制参数．
英文摘要：
The flow around a stationary and in-line oscillating circular cylinder in a uniform flow at Reynolds number of 150 is studied by solving Navier-Stokes equations on a moving grid system described by Arbitrary Largangian-Eulerian （ALE） method. The main objective is to investigate the lift and drag features and vortex shedding modes through different reduced oscillating frequencies and relatively large amplitudes, where the ratio of amplitude and diameter A/D ranges from 0.3 to 1.2. Present numerical results show that there are several modes of vortex shedding such as symmetrical S and anti-symmetrical A-Ⅰ, A-Ⅲ and A-Ⅳ modes. Through analysis of previous and present results, the region of lock-on is extended, which is divided into five sub-regions. Especially, the force on the circular cylinder at the anti-symmetrical A-Ⅰ mode shows more complex characters than the original mode. Based on the experimental and numerical results, we suggest that the radio of maximum acceleration Afc^2/Dfs0^2 should be an important parameter for vortex shedding modes, especially for the symmetrical S mode .
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